\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Descriptive statistics, pre- and post-2008}
\begin{tabular*}{\hsize}{@{\hskip\tabcolsep\extracolsep\fill}l*{8}{c}}
\toprule
&\multicolumn{2}{c}{GSS}  &\multicolumn{2}{c}{HRS}  &\multicolumn{2}{c}{BHPS} &\multicolumn{2}{c}{SOEP} \\
&\specialcell{pre-\\ 2008}&\specialcell{post-\\ 2008}&\specialcell{pre-\\ 2008}&\specialcell{post-\\ 2008}&\specialcell{pre-\\ 2008}&\specialcell{post-\\ 2008}&\specialcell{pre-\\ 2008}&\specialcell{post-\\ 2008}\\
&            &            &            &            &            &            &            &            \\
\midrule
Age&        38.8&        41.4&        56.9&        57.6&        39.2&          41&        39.7&        42.6\\
&      (11.7)&      (12.7)&      (3.79)&       (3.8)&      (12.3)&      (12.5)&      (11.5)&      (11.8)\\
\addlinespace
Male&        .529&        .505&        .479&        .485&        .525&        .483&        .576&        .529\\
&      (.499)&        (.5)&        (.5)&        (.5)&      (.499)&        (.5)&      (.494)&      (.499)\\
\addlinespace
Married&        .628&        .521&        .732&        .722&        .575&        .531&        .589&        .525\\
&      (.483)&        (.5)&      (.443)&      (.448)&      (.494)&      (.499)&      (.492)&      (.499)\\
\addlinespace
Non-white&        .165&        .266&        .135&        .194&       .0382&        .078&            &            \\
&      (.371)&      (.442)&      (.342)&      (.395)&      (.192)&      (.268)&            &            \\
\addlinespace
Immigrant&       .0888&        .127&       .0818&        .115&       .0565&          .1&        .124&         .14\\
&      (.284)&      (.333)&      (.274)&      (.319)&      (.231)&        (.3)&       (.33)&      (.347)\\
\addlinespace
Tertiary degree&        .257&        .324&        .549&        .665&        .474&        .455&         .27&        .326\\
&      (.437)&      (.468)&      (.498)&      (.472)&      (.499)&      (.498)&      (.444)&      (.469)\\
\addlinespace
Part-time worker&        .167&        .174&        .118&        .112&        .245&        .337&        .153&        .197\\
&      (.373)&      (.379)&      (.322)&      (.315)&       (.43)&      (.473)&       (.36)&      (.398)\\
\addlinespace
Union member&        .155&        .115&         .22&        .188&        .306&        .293&            &            \\
&      (.362)&      (.319)&      (.414)&      (.391)&      (.461)&      (.455)&            &            \\
\addlinespace
Temporary worker&            &            &            &            &       .0689&       .0641&        .112&        .132\\
&            &            &            &            &      (.253)&      (.245)&      (.315)&      (.339)\\
\addlinespace
Self-employed without employees$^a$&        .129&        .117&            &            &        .119&            &        .113&          .1\\
&      (.335)&      (.322)&            &            &      (.324)&            &      (.316)&      (.301)\\
\addlinespace
Self-employed with employees&            &            &            &            &       .0358&            &            &            \\
&            &            &            &            &      (.186)&            &            &            \\
\addlinespace
Marginally employed&            &            &            &            &            &            &       .0362&       .0688\\
&            &            &            &            &            &            &      (.187)&      (.253)\\
\addlinespace
Job tenure&            &            &            &            &        5.05&        8.44&        9.87&        10.9\\
&            &            &            &            &      (6.57)&      (7.36)&      (9.79)&      (10.5)\\
\midrule
\(N\)&        8648&        2521&       29920&       24518&       84882&       59562&      164931&      152109\\
\tabnotes{9}{a: This row displays the mean for all self-employed workers for the US and Germany.}
